Hannover 2016 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 52: Ultrashort Laser Pulses II
Q 52.7: Talk
Thursday, March 3, 2016, 16:00–16:15, a310
Effect of multiphoton resonances on femtosecond filaments in gaseous media — •Carsten Bree1,2 and Michael Hofmann1,3 — 1Weierstraß-Institut für Angewandte Analysis und Stochastik — 2Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie — 3Institut für Theoretische Physik, Technische Universität Berlin
A femtosecond filament is a longitudinally extended channel of intense laser radiation and plasma which appears to be diffraction-free. Theoretically, it is described by assuming a phenomenological model of the optical response which consists of the all-optical Kerr effect and the Drude model accounting for ionization effects due to the high field-strength. However, recent research indicates that one has to go beyond this phenomenological description and resort to full quantum calculations of the optical response [1].
By solving the time-dependent Schrödinger equation, we obtain the atomic dipole response and conclude that multiphoton resonances strongly influence the field-induced nonlinear refractive index Δ n. Plugging the calculated Δ n into a propagation equation for the optical field enables us to observe the impact of multiphoton resonances on filamentary propagation [2].
M. Kolesik et al., Optica 1, 323(2014).
M. Hofmann and C. Brée, Phys. Rev. A 92, 013813(2015).